Question

我有一个AuditAnswersTable，其中包含审计问题的答案，并且它具有与AuditTable相关的条目的id。

我现在想要删除没有提供答案的所有审核。我有这个工作查询，但我觉得必须有一个更简单的方法吗？

DELETE FROM AuditTable
WHERE id IN (
    SELECT id FROM AuditTable
    WHERE id NOT IN (
        SELECT DISTINCT audit_id
        FROM AuditAnswersTable
    )
)

Answer 1

您可以通过LEFT JOIN避免子选择：

DELETE a
FROM AuditTable a
    LEFT JOIN AuditAnswersTable t
        ON a.id = t.audit_id
WHERE t.audit_id IS NULL ;

Answer 2

是

DELETE FROM AuditTable
WHERE id NOT IN (
    SELECT DISTINCT audit_id
    FROM AuditAnswersTable
)

简化SQL删除查询

2 个答案: